可接枝型紫外光吸收剂对XLPE绝缘性能的影响

Influences of Grafted Light Stabilizer on the Insulation Performances of XLPE

以2-(2′-羟基-5′-甲基苯基)苯并三唑(UV-P)和丙烯酰氯为原料合成2-(2′-丙酰氧基-5′-甲基苯基)苯并三唑(AMB),使其与低密度聚乙烯(LDPE)、过氧化二异丙苯(DCP)熔融共混,经交联固化使AMB接枝到PE大分子链上,得到AMB接枝的交联聚乙烯材料(AMB-g-XLPE)。测试了纯XLPE、UV-P/XLPE和AMB-g-XLPE的耐抽提性、凝胶含量、交流击穿场强、电树引发电压和相对介电常数等。实验结果表明,化学接枝能极大程度改善小分子化合物的耐抽提能力;当AMB和UV-P的质量分数为0.2时,相比纯XLPE,AMB-g-XLPE的交流击穿场强提高16.27%,达到63.16 kV/mm,UV-P/XLPE的交流击穿场强提高至60.19 kV/mm;同时二者都能提高XLPE的电树引发电压。

2-(2′-propyloxy-5′-methylphenyl)benzotriazole(AMB)was synthesized from^(2)-(2′-hydroxy-5′-methylphenyl)benzotriazole(UV-P)and acryloyl chloride,which was fused with low density polyethylene(LDPE)particles and dicumyl peroxide(DCP).After crosslinking curing,AMB was grafted onto polyethylene(PE)macromolecular chains,and AMB grafted cross-linked polyethylene material(AMB-g-XLPE)was obtained.The resistant extraction ability,gel content,alternating current(AC)breakdown strength,electrical tree initiation voltage and relative dielectric constant of pure XLPE,UV-P/XLPE and AMB-g-XLPE were measured.The results show that chemical grafting can greatly improve the resistant extraction ability of small molecule compounds.Comparing with pure XLPE,when the addition of AMB and UV-P is 0.2%,the AC breakdown field strength of AMB-g-XLPE increases 16.27%,reaching 63.16 kV/mm.And the AC breakdown field strength of UV-P/XLPE increases to 60.19 kV/mm.Both of them can improve the electrical tree initiation voltage of XLPE.